Sports initiated earthquakes Jearl Walkerwww.flyingcircusofphysics.comApril 2016 Seismologists have long been known for detecting earthquakes and nuclear bomb tests but they have also been able to detect smaller events such as the truck-bomb blast in Nairobi, Kenya, in 1998 in a terrorist attack on the American embassy. In recent times, they have turned their attention to ground shaking due to enthusiastic jumping and yelling by fans at sporting events. The noise level itself can be high enough that the stadium and ground shake in a random way, sending out seismic waves through the local ground. Here is an explanation given on CNN to host Brooke Baldwin about the seismic activity recorded when the Seattle Seahawks won against the New Orleans Saints in an American football game played in Seattle:

This next video might be the first time ground shaking due to sports fans was detected. When Louisiana State University scored a last-minute, winning touchdown against Auburn University in 1988, 80,000 LSU fans suddenly leaped up for joy and then jumped in place for a minute or so:

Such enthusiasm during a game is wonderful but I would be fearful if there is a prolonged and coordinated jumping in a stadium. The repeated pounding on the ground will send out a strong ground wave but could also break the support structure of the stadium. The coordinated jumping would produce a much stronger ground wave than random jumping. Here is an example from Frankfurt: